I am using OMV for vm storage.
How much deference would more memory make as far as performance?
Will I notice much upgrading from 4 gig to 8 or 16 gig.
Does OMV use memory for read and or write performance?
I have 8 15k SAS drives in a software raid 10 now but need more speed.
Using NFS for shared storage.
Is there any tweaks to OMV I can do to get more iops without adding more drives or
going SSD.
What speeds do you achieve with your setup at the moment? Speaking: what is the read/write performance of your Raid?
More RAM is never a bad idea, but the application should be written to take advantage of it.
Greetings
David
I doubt more memory would help RAID 10. Are you maxing out the gigabit connection? If not, maybe a a faster processor. You don't give many system details.
I think that he is running VMs on his raid, and that the IO is going on the knees.
But yes, you're right. He has not given us much details.
Greetings
David
Here is all the Specs
0.4.31 (Fedaykin)
Intel Xeon CPU E5405 @2.00Ghz Quad core
Load avg does go above 1 at peak times.
8 gig of ram. I thought it only had 4.
Linux 3.2.0.bpo.3-amd64. Had to upgrade the Linux to support controller card.
8 Seagate ST3300657SS Hard drives software Raid 10
HDD Controller SAS2LP-MV8
Filesystem ext4
2 Gig links bonded
Bond peaks at about 750M transfer.
Share is NFS with number of servers set to 32
Extra options on share subtree_check,secure,async
The problem is I get an email several times a day about OMV
load average being high and my systems getting slow.
I currently have 6 Virtual machines running off it.
What is the best test for read/write performance of your Raid?
That hdd controller doesn't get the best reviews for its Linux drivers. Any errors in the logs? You can check the speed by - substitute your raid uuid (find with blkid) in command:
dd if=/dev/zero of=/media/uuid/test.dd bs=1M count=2000
dd if=/media/uuid/test.dd of=/dev/null bs=1M
For testing your read/write perfomance change to /media/UUIDofyourraid/
Write test:
That writes 10GB to your Raid into the file 'tempfile'
Read test:
That read the 10GB File from your raid
You can test with 100GB too, just add another 0 to the counter...
Greetings
David
I will run the test the first chance I get and post.
This is the error I get all the time
Resource limit matched Service localhost
Date: Fri, 31 May 2013 07:20:04 -0400
Action: alert
Host: OMV01
Description: loadavg(5min) of 3.2 matches resource limit [loadavg(5min)>2.0]
Your faithful employee,
monit
You will be able to turn that off in OMV 0.5. It isn't an error. Just telling you the load average is a little high (which may or may not be a problem).
Here are my speed results.
How do they compare to others.
root@OMV03:~# dd if=/dev/zero of=/media/17affd60-8971-4f30-b449-2644015526e4/test.dd bs=1M count=2000
2000+0 records in
2000+0 records out
2097152000 bytes (2.1 GB) copied, 7.08222 s, 296 MB/s
root@OMV03:~# dd if=/media/17affd60-8971-4f30-b449-2644015526e4/test.dd of=/dev/null bs=1M
2000+0 records in
2000+0 records out
2097152000 bytes (2.1 GB) copied, 0.889244 s, 2.4 GB/s
Your write speed is good, there are others that get way higher write speeds, but even yours should be sufficient.
Your read speed is high, but i think your cache is messing around with the data here...
Maybe next time you get the load message you could look via top or htop what is producing the heavy load (its cpu load btw).
Greetings
David
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